Events in Visual Basic
An event is a message sent by an object announcing that something has happened. Events are implemented using delegates, a form of object-oriented function pointer that allows a function to be invoked indirectly by way of a reference to the function.
In This Section
- Events and Event Handlers
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Provides an overview of events, event handlers, and associated terminology.
- WithEvents and the Handles Clause
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Demonstrates how to use the WithEvents keyword and the Handles clause to associate an event with an event handler.
- AddHandler and RemoveHandler
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Demonstrates how to use the AddHandler and RemoveHandler statements to dynamically associate an event with an event handler.
- How to: Add Events to a Class
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Describes the process of defining events.
- How to: Create Event Handlers in the Visual Basic Code Editor
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Gives directions for using the Visual Basic Code Editor to write code to respond to events.
- How to: Raise an Event (Visual Basic)
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Demonstrates how to define an event and uses the RaiseEvent statement to cause the event to occur
- How to: Create an Event and Handler (Visual Basic)
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Demonstrates how to define an event and an event handler, and how to use the AddHandler statement to associate them.
- How to: Write Event Handlers
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Demonstrates how to write event handlers using the Handles clause or the AddHandler statement.
- How to: Handle Events in Visual Basic
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Defines a class that raises an event when you call the CauseEvent method.
- Walkthrough: Declaring and Raising Events
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Steps you through the process of declaring and raising events for a class.
- Walkthrough: Handling Events
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Demonstrates how to write an event-handler procedure.
- How to: Declare Events That Avoid Blocking
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Demonstrates how to define a custom event that allows its event handlers to be called asynchronously.
- How to: Declare Events That Conserve Memory Use
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Demonstrates how to define a custom event that uses memory only when the event is handled.
- Troubleshooting Inherited Event Handlers in Visual Basic 2005
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Lists common issues that arise with event handlers in inherited components.
